CN220224979U - Height-adjustable cast-in-situ box girder formwork system - Google Patents

Abstract

The utility model discloses a height-adjustable cast-in-place box beam formwork system. The box beam side formwork includes a concave arc plate. The outer arc surface of the concave arc plate is symmetrically connected to its mid-span position with a height-adjustable connection. piece, the end of the height-adjustable connector away from the concave arc plate is connected to the convex arc plate. The height-adjustable connector can make the concave arc plate close to or away from the convex arc plate. The height-adjustable connector There are several side formwork square timbers arranged at intervals. The first sides of the concave arc plate and the convex arc plate are in smooth contact with the box girder bottom form and the box girder wing form respectively. The concave arc plate and the convex arc plate are respectively The second sides are all in smooth contact with the plane where the upper end surfaces of several side mold square timbers are located. The concave arc plate, the outer convex arc plate and the several side mold square timbers jointly support side mold panels. The purpose of the utility model is to solve the problems of inability to adjust the height, poor flexibility, low turnover utilization rate, difficulty in transporting, storing and hoisting the formwork, and high construction difficulty and cost.

Description

A height-adjustable cast-in-place box beam formwork system

Technical field

The utility model belongs to the technical field of cast-in-place box girder construction in bridge engineering, and specifically relates to a height-adjustable cast-in-place box girder formwork system.

Background technique

With the continuous construction of my country's highway network, the number and scale of highway bridges are constantly growing, and there is still a large demand for bridge construction. The cast-in-place box girder construction method is widely used in bridge construction due to its good integrity and relatively mature process flow. The support formwork system is a key factor in quality control in cast-in-place box girder construction.

The patent application with publication number CN110158479A discloses an arc-shaped bracket combination formwork for cast-in-place box beams and a method for erecting the same. Although the arc-shaped bracket combination formwork for cast-in-place box beams solves the problem of The steel formwork and brackets of the formwork (web formwork and wing formwork) are hoisted and transported with heavy tasks, low efficiency, and high cost. However, the height of the arc-shaped bracket combination formwork used for cast-in-place box girders cannot be adjusted, and the flexibility is poor and the turnover is difficult. The utilization rate is very low and cannot be applied to other projects with different beam heights, which increases the construction cost; in addition, the web formwork and wing formwork of the arc-shaped bracket combination formwork used for cast-in-place box beams are integral continuous steel formworks, which The structure is relatively bulky, and there are still difficulties in transporting, storing and hoisting the formwork, which increases the difficulty of construction.

Utility model content

In view of the problems existing in the prior art, this utility model provides a height-adjustable cast-in-place box beam formwork system, which aims to solve the problem of inability to adjust the height, poor flexibility, low turnover utilization rate, and difficulties in transporting, storing and hoisting the formwork. , the problem of high construction difficulty and cost.

In order to solve the above technical problems, the present utility model is implemented through the following technical solutions:

According to a first aspect of the present invention, a height-adjustable cast-in-place box girder formwork system is provided, which includes a box girder bottom form, a box girder side form connected to both ends of the box girder bottom form, and a box girder side form connected to the box girder side. box girder wing forms at both ends of the formwork;

The box girder side formwork includes a concave arc plate. The outer arc surface of the concave arc plate is connected to a height-adjustable connector symmetrically at its mid-span position. The height-adjustable connector is located away from the One end of the concave arc plate is connected to the convex arc plate. The height-adjustable connector can make the concave arc plate approach or move away from the convex arc plate. The height-adjustable connector has A number of side mold square timbers arranged at intervals are set up. The first sides of the concave arc plate and the convex arc plate are in smooth contact with the box beam bottom mold and the box beam wing mold respectively. The second side of the arc plate and the convex arc plate are in smooth contact with the plane where the upper end surfaces of some of the side mold square timbers are located, and the concave arc plate, the convex arc plate and a number of the The side formwork square timbers jointly support side formwork panels.

In a possible implementation of the first aspect, the height-adjustable connecting member includes a connecting ear plate, a long connecting plate and a bolt and nut member, and the connecting ear plate is fixed on the concave arc plate. On the outer arc surface, a first through hole is provided on the connecting ear plate. The upper end of the long connecting plate is connected to the outer convex arc plate. The long connecting plate is spaced apart along the length direction. There are a plurality of second through holes. The first through hole on the connecting ear plate is connected with any second through hole on the long connecting plate through the bolt and nut parts.

In a possible implementation of the first aspect, the upper end of the elongated connecting plate and the convex arc plate are detachably connected through the bolt and nut parts.

In a possible implementation of the first aspect, the box girder bottom form includes a number of steel beams arranged at intervals along the width direction of the box girder, and a number of bottom forms orthogonal to the steel beams are arranged at intervals on the number of steel beams. Square timber, several bottom mold square timbers are supported with bottom mold panels; the first side of the concave arc plate is in smooth contact with the upper end surfaces of several bottom mold square timbers, and the bottom mold panels are in contact with the Butt the lower ends of the side mold panels.

In a possible implementation of the first aspect, the box girder bottom form further includes a plurality of first vertical poles supported at the bottom of the steel girder.

In a possible implementation of the first aspect, the box girder wing form includes a wing form square timber that is in smooth contact with the first side of the convex arc plate, and a wing form panel is supported on the wing form square timber. , the wing form panel is docked with the upper end of the side form panel.

In a possible implementation of the first aspect, the box girder wing form further includes a plurality of second vertical poles supported on the bottom of the square wood of the wing form.

In a possible implementation of the first aspect, a plurality of the second vertical rods are connected in sequence through horizontal tie rods.

In a possible implementation of the first aspect, the box girder side form further includes an oblique bar supported on the height-adjustable connecting member, and the oblique bar is connected to the second vertical bar.

According to the second aspect of the present invention, a method for erecting a height-adjustable cast-in-place box beam formwork system is provided, including:

Support box girder bottom formwork and box girder wing formwork;

By adjusting the height-adjustable connector so that the distance from the concave arc plate to the convex arc plate meets the formwork requirements of the box beam to be constructed, the concave arc plate and the convex arc plate are The first side of the convex arc plate is in smooth contact with the installed box girder bottom form and the box girder wing form respectively. A number of side formwork square logs arranged at intervals are set up on the height-adjustable connector, so that several The upper end surface of the side mold square wood is in smooth contact with the second side of the concave arc plate and the convex arc plate. Side form panels are provided on a number of side formwork square logs.

Compared with the existing technology, the utility model has at least the following beneficial effects:

The utility model provides a height-adjustable cast-in-place box beam formwork system. Because the concave arc plate and the convex arc plate are connected through height-adjustable connectors, the concave arc plate is in smooth contact with the box beam bottom formwork. The outer convex arc plate is in smooth contact with the box girder wing formwork. Therefore, for box girder construction scenarios with different girder heights, when setting up the cast-in-place box girder formwork, you only need to use height-adjustable connectors to adjust and change the concave arc according to the height of the box to be constructed. The distance between the plate and the convex arc plate can meet the construction requirements, realize the pouring of box beams with different beam heights, and also ensure that the arc angle of the box beam remains unchanged. The concave arc plate is in smooth contact with the box girder bottom formwork, and the convex arc plate is in smooth contact with the box girder wing formwork. The structure is spliced in blocks, which facilitates the transportation, storage and hoisting of formwork components and reduces the difficulty of construction. In summary, the utility model effectively solves the problems of inability to adjust the height, poor flexibility, low turnover utilization, difficulty in transporting, storing and hoisting the formwork, and high construction difficulty and cost.

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the attached drawings.

Description of the drawings

In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the following will briefly introduce the drawings that need to be used in the description of the specific embodiments. Obviously, the drawings in the following description are some of the technical solutions of the present utility model. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic diagram of the overall axial side of a height-adjustable cast-in-place box beam formwork system according to an embodiment of the present utility model;

Figure 2 is a partially enlarged axial side schematic diagram of a height-adjustable cast-in-place box girder formwork system according to an embodiment of the present invention;

Figures 3a and 3b are respectively two views of the connection between the concave arc plate, the height-adjustable connector and the convex arc plate in a height-adjustable cast-in-place box beam formwork system according to the embodiment of the present invention;

Figures 4a, 4b and 4c are respectively schematic diagrams of the height adjustment states of the concave arc plate, the height-adjustable connector and the convex arc plate in a height-adjustable cast-in-place box beam formwork system according to the embodiment of the present invention;

Figure 5 is a schematic diagram of the overall axial side of a height-adjustable cast-in-place box girder formwork system (including box girder) according to an embodiment of the present invention;

Figure 6 is an overall front view of a height-adjustable cast-in-place box girder formwork system (including box girder) according to an embodiment of the present invention.

In the picture: 1-box beam bottom formwork; 100-steel beam; 101-bottom formwork square timber; 102-bottom formwork panel; 103-first vertical pole;

2-Box beam side formwork; 200-Inward concave arc plate; 201-Height-adjustable connector; 2010-Connecting ear plate; 2011-Long connecting plate; 2012-Bolts and nuts; 202-External convex arc plate ; 203-Side formwork square wood; 204-Side formwork panel; 205-Diagonal rod;

3-box girder wing form; 300-wing form square wood; 301-wing form panel; 302-second vertical pole; 303-horizontal tie rod;

4-Box beam.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model. Not all examples. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

As shown in Figure 1 and Figure 2, the embodiment of the present invention is a height-adjustable cast-in-place box girder formwork system, which includes a box girder bottom form 1, a box girder side form 2 connected to both ends of the box girder bottom form 1, and a box girder side form 2 connected to both ends of the box girder bottom form 1. Box girder side molds 2 and box girder wing molds 3 at both ends. Specifically, as shown in Figure 3a and Figure 3b, the box girder side form 2 includes a concave arc plate 200. The outer arc surface of the concave arc plate 200 is symmetrically connected to its mid-span position with a height-adjustable connector 201. , the end of the height-adjustable connector 201 away from the concave arc plate 200 is connected to the convex arc plate 202. The height-adjustable connector 201 can make the concave arc plate 200 close to or away from the convex arc plate 202. That is to say, by adjusting the height-adjustable connector 201, the position of the concave arc plate 200 relative to the convex arc plate 202 can be changed, thereby adapting to box girder construction projects with different beam heights. As shown in Figure 2, the height-adjustable connector 201 is provided with a number of side formwork square timbers 203 arranged at intervals. The first sides of the inner concave arc plate 200 and the outer convex arc plate 202 are respectively connected with the box beam bottom mold 1 and The box girder wing mold 3 is in smooth contact. The second sides of the inner concave arc plate 200 and the outer convex arc plate 202 are in smooth contact with the planes of the upper end surfaces of several side mold square timbers 203. The inner concave arc plate 200 and the outer convex arc plate are in smooth contact Side formwork panels 204 are supported on the board 202 and several side formwork square timbers 203 together. In a specific example, the side mold panel 204 is made of bamboo plywood, and the side mold panel 204 is connected and fixed with the side mold square wood 203 through iron nails.

Specifically, in the height-adjustable cast-in-place box beam formwork system of this embodiment, because the concave arc plate 200 and the convex arc plate 202 are connected through the height-adjustable connector 201, the concave arc plate 200 is connected to the box beam. The bottom formwork 1 is in smooth contact, and the convex arc plate 202 is in smooth contact with the box girder wing formwork 3. Therefore, for box girder construction scenarios with different girder heights, when setting up the cast-in-place box girder formwork, it is only necessary to use the adjustable height according to the height of the box to be constructed. The connector 201 adjusts and changes the distance between the concave arc plate 200 and the convex arc plate 202 to meet the construction requirements and realize the pouring of box beams with different beam heights, and it can also ensure that the arc angle of the box beam remains unchanged. . At the same time, the concave arc plate 200 of this embodiment is in smooth contact with the box girder bottom mold 1, and the outer convex arc plate 202 is in smooth contact with the box girder wing mold 3. The structure is pieced together to facilitate the transportation and storage of the formwork components. and hoisting, which reduces the difficulty of construction.

In some embodiments, as shown in Figure 3a and Figure 3b, the height-adjustable connector 201 includes a connecting ear plate 2010, a long connecting plate 2011 and a bolt and nut member 2012. The connecting ear plate 2010 is fixed to the concave arc plate. On the outer arc surface of 200, the connecting ear plate 2010 is provided with a first through hole. For example, the connecting ear plate 2010 is fixedly connected to the outer arc surface of the concave arc plate 200 by welding. The upper end of the long connecting plate 2011 is connected to the convex arc plate 202. A number of second through holes are spaced along the length direction on the long connecting plate 2011 to connect the first through holes on the ear plate 2010 with the long strip. Any second through holes on the connecting plate 2011 are connected through bolts and nuts 2012 after docking. For example, two first through holes are provided on the connecting lug plate 2010, nine second through holes are provided at intervals along the length direction on the elongated connecting plate 2011, and the bolt and nut parts 2012 are made of carbon steel.

As shown in Fig. 4a, Fig. 4b and Fig. 4c, the height-adjustable connector 201 is used to adjust and change the distance between the concave arc plate 200 and the convex arc plate 202. Specifically, after disassembling the bolts and nuts 2012, make the connection After the first through hole on the ear plate 2010 is connected with the second through hole on the elongated connecting plate 2011 that meets the construction height of the box beam, the bolt nut 2012 is then used to penetrate the first through hole and the corresponding second through hole. Just tighten the connection, the operation is convenient and fast, the design cost is low, and it is easy to disassemble and transport. For example, Figure 4a shows the adjusted position state when the box girder height is low; Figure 4b shows the adjusted position state when the box girder height is the next lowest; Figure 4c shows the adjusted position state when the box girder height is large .

Preferably, as shown in Figure 3a and Figure 3b, the upper end of the long connecting plate 2011 and the convex arc plate 202 are also detachably connected through bolts and nuts 2012. This design is more conducive to the cast-in-place box beam formwork components. Disassembly, transportation and hoisting installation.

In this embodiment, the concave arc plate 200, the height-adjustable connector 201 and the convex arc plate 202 are all made of steel plates. Holes are opened on the strip connecting plate 2011 according to the needs of the site, and the connection holes can be adjusted to achieve the desired result. The effect of adjusting the height of the template. Preferably, as shown in Figures 3a and 3b, a plurality of stiffening plates (steel plates) are provided on the outer arc surface of the concave arc plate 200 to enhance the stability of the concave arc plate 200. Connection holes are provided on the stiffening plates at both ends of the concave arc plate 200. Specifically, as shown in Figure 3a and Figure 3b, it is a structural unit. The segments are connected according to the needs of on-site construction, and the segments are connected by bolts. Pass through the connection hole opened on the stiffening plate to connect.

In one embodiment, as shown in FIGS. 1 and 2 , the bottom formwork 1 of the box girder includes a number of steel beams 100 spaced apart along the width direction of the box girder. In the example, the steel beams 100 are I-beams. A number of bottom formwork square timbers 101 orthogonal to the steel beams 100 are arranged at intervals on several steel beams 100, and a number of bottom formwork square timbers 101 support bottom formwork panels 102, that is, several steel beams 100 and several bottom formwork orthogonal to them are used. The square wood 101 supports the bottom formwork panel 102, and the bottom formwork square wood 101 plays the role of support and load transmission. The first side of the concave arc plate 200 is in smooth contact with the upper end surfaces of several bottom mold square logs 101, and the bottom mold panel 102 is butt-jointed with the lower end of the side mold panel 204. As an example, the bottom form panel 102 is made of bamboo plywood, and the bottom form panel 102 and the bottom form square wood 101 are connected with iron nails to play a fixing role.

On the basis of the above embodiments, as a more preferred implementation, as shown in Figure 2, the box girder bottom mold 1 also includes a plurality of first vertical poles 104, and the plurality of first vertical poles are supported at the bottom of each steel beam 100. Rod 104 uses the first vertical pole 104 to realize the overall support of the steel beam 100, the bottom formwork square timber 101 and the bottom formwork panel 102, bear the box beam and construction load and transmit it to the foundation. As an example, the first vertical pole 104 is made of Q235 hollow steel pipe.

In one embodiment, as shown in FIGS. 1 and 2 , the box girder wing formwork 3 includes a wing formwork square wood 300 that is in smooth contact with the first side of the convex arc plate 202 , and the wing formwork square wood 300 is supported on the wing formwork square wood 300 . The panel 301, the wing form panel 301 and the upper end of the side form panel 204 are connected to realize the smooth connection between the box girder side form 2 and the box girder wing form 3. For example, the wing form panel 301 is made of bamboo plywood, and the wing form panel 301 and the wing form square wood 300 are connected with iron nails for fixation.

On the basis of the above embodiments, as a more preferred implementation, as shown in Figure 2, the box girder wing form 3 also includes a plurality of second vertical poles 302, and a plurality of second vertical poles 302 are supported at the bottom of each wing form square wood 300. The vertical pole 302 uses the second vertical pole 302 to realize the overall support of the wing formwork square wood 300 and the wing formwork panel 301. Similarly, the material of the second vertical pole 302 is Q235 hollow steel pipe.

More preferably, the plurality of second vertical poles 302 are connected in sequence through horizontal tie rods 303, and the horizontal tie rods 303 are used to connect the plurality of second vertical poles 302 to form a whole, which improves the alignment of the plurality of second vertical poles 302 to the wing mold square wood 300 and the The overall support of the wing form panel 301 is stable and reliable. As an example, the horizontal tie rod 303 is made of Q235 hollow steel pipe.

In one embodiment, as shown in FIGS. 1 and 2 , the box girder side formwork 2 also includes an inclined rod 205 supported on the height-adjustable connector 201 . The inclined rod 205 is connected to the second vertical rod 302 , that is, using an inclined rod 205 . The rod 205 realizes the overall support of the concave arc plate 200, the height-adjustable connector 201, the convex arc plate 202, the side mold square wood 203 and the side mold panel 204, and effectively cooperates with the second vertical pole 302 when supporting. Takes up little space. For example, steel buckles are used to fix the inclined rod 205 and the second vertical rod 302 together to form a whole body, and the material is steel.

As shown in Figure 5 and Figure 6, a method for erecting a height-adjustable cast-in-place box girder formwork system according to the embodiment of the present invention is as follows:

1. Scaffolding erection

The scaffolding adopts the buckle type scaffolding, the steel pipe diameter is 48mm, the pipe wall thickness is 3.25mm, and the material is Q235 carbon structural steel. The scaffolding is divided into vertical poles, horizontal tie rods and inclined rods (9). The distance between the vertical poles is 0.6m. The horizontal tie rods are connected through circular buckles, and the inclined rods are connected to the vertical poles through connecting buckles to form a whole. Place I10 I-beam steel on the top of the frame below the bottom formwork panel, with the direction consistent with the direction of the bridge, with a spacing of 0.6m; place 100mm×100mm bottom formwork square timber above the I-beam, with the direction perpendicular to the direction of the bridge; lay bottom formwork above the bottom formwork square timber The mold panel is made of 10mm thick bamboo plywood.

2. Assembly of steel rib plates (assembly of concave arc plates, height-adjustable connectors and convex arc plates)

The steel rib plate consists of three parts: a concave arc plate, a height-adjustable connector and an outer convex arc plate. The outer arc surface of the concave arc plate is welded with connecting ear plates and stiffening plates. Each component of the steel rib plate All are designed and prefabricated according to site conditions. Preserve holes in advance for connecting the lug plate, the long strip connecting plate and the convex arc plate, connect the three from bottom to top through bolts and nuts, and adjust the connecting holes between the connecting ear plate and the long strip connecting plate to achieve The effect of adjusting the height of the concave arc plate.

3. System connection

A crane is used to lift the steel ribs to the designed position. The steel ribs are supported by side formwork square timbers, and the sides are supported by diagonal bars. The two steel ribs are connected by bolts, and the connection locations are at both ends of the concave arc plates. Stiffening plate; Use iron wire to tie 100mm × 100mm side formwork square timbers at the connecting rod position of the steel rib plate along the direction of the bridge. The spacing between the square timbers is determined by the height of the long connecting plate, and is evenly arranged and not larger than 300mm; the side formwork panels are made of The 10mm thick bamboo plywood is bent along the arc direction of the steel ribs, and is connected and fixed with the side formwork square wood through iron nails. The length of the bamboo plywood is cut or spliced according to the size of the box beam. The space between the two bamboo plywood is filled with foam glue and Sand smooth. After the height-adjustable cast-in-place box beam formwork system is installed, the box beam 4 is poured.

Through modeling calculation and in-depth design of the stress on the formwork at the web and flange plates, the support formwork was designed in the form of steel ribs, which reduced the amount of steel while ensuring the strength and stability of the structure, supplemented by bamboo glue. The combined use of panels reduces the weight of the structure and saves material costs. The formwork is segmented in the length direction of the bridge to facilitate construction and hoisting; in the height direction, a three-section design and height-adjustable connectors are used to realize the height adjustment of the overall formwork system, which increases the applicability of the formwork system and improves the The turnover utilization rate of the formwork system, the overall flexibility of the formwork system and the precise connection and fixation ensure reliable, green and safe construction of cast-in-place box beams.

The height-adjustable cast-in-place box beam formwork system of this embodiment has the following benefits:

1. This formwork system is designed in the form of ribs, which reduces the amount of steel while ensuring the strength and stability of the structure. It is supplemented by the use of bamboo plywood, which reduces the weight of the structure and saves material costs;

2. This formwork system adopts a segmented design in both the length and height directions of the bridge, allowing the height and length of the overall formwork system to be adjusted, increasing the applicability of the formwork system and improving the turnover utilization of the formwork system;

3. The structural connection of this formwork system is simple and reliable, easy to install and disassemble, highly integrated with the scaffolding, easy to operate, and high in construction efficiency.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "bottom", "inner", "outer", etc. is based on the orientation or position shown in the drawings. The relationship is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

In the present utility model, unless otherwise explicitly stipulated and limited, the terms "connected", "connected" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integration; it can be A mechanical connection can also be an electrical connection or can communicate with each other; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interactive relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the present invention, unless otherwise expressly stipulated and limited, the first feature "on" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in direct contact through an intermediate medium. indirect contact. Furthermore, the terms "above", "above" and "above" the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "below" and "beneath" the first feature to the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.

In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean specific features, structures, materials described in conjunction with the embodiment or examples. Or features are included in at least one embodiment or example of the invention. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification unless they are inconsistent with each other.

Finally, it should be noted that the above-mentioned embodiments are only specific implementations of the present utility model and are used to illustrate the technical solution of the present utility model, rather than to limit it. The protection scope of the present utility model is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any person familiar with the art can still make changes to the methods described in the foregoing embodiments within the technical scope disclosed by the present utility model. The technical solutions may be modified or changes can be easily imagined, or some of the technical features may be equivalently replaced; and these modifications, changes or substitutions do not deviate from the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present utility model. All are covered by the protection scope of this utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims (9)

1. The height-adjustable cast-in-situ box girder formwork system is characterized by comprising a box girder bottom formwork (1), box girder side formworks (2) connected to two ends of the box girder bottom formwork (1) and boxes Liang Yimo (3) connected to two ends of the box girder side formworks (2);

the box girder side die (2) comprises an inner concave arc plate (200), a height-adjustable connecting piece (201) is symmetrically connected to the outer arc surface of the inner concave arc plate (200) at the midspan position of the inner concave arc plate, one end of the height-adjustable connecting piece (201), which is far away from the inner concave arc plate (200), is connected with an outer convex arc plate (202), the height-adjustable connecting piece (201) can enable the inner concave arc plate (200) to be close to or far away from the outer convex arc plate (202), a plurality of side die square boards (203) which are arranged at intervals are arranged on the height-adjustable connecting piece (201), the first edges of the inner concave arc plate (200) and the outer convex arc plate (202) are respectively in smooth contact with the box girder bottom die (1) and the box girder wing die (3), the second edges of the inner concave arc plate (200) and the outer arc plate (202) are respectively in smooth contact with a plurality of upper end faces of the side die square boards (203), and the inner concave arc plate (200), the inner concave arc plate (200) and the outer arc square boards (203) are connected with the side die square boards (204).

2. The height-adjustable cast-in-situ box girder formwork system according to claim 1, wherein the height-adjustable connecting piece (201) comprises a connecting lug plate (2010), a strip-shaped connecting plate (2011) and a bolt nut piece (2012), the connecting lug plate (2010) is fixed on an outer cambered surface of the concave circular arc plate (200), a first through hole is formed in the connecting lug plate (2010), the upper end of the strip-shaped connecting plate (2011) is connected with the outer convex circular arc plate (202), a plurality of second through holes are formed in the strip-shaped connecting plate (2011) at intervals along the length direction, and the first through hole in the connecting lug plate (2010) is connected with any second through hole in the strip-shaped connecting plate (2011) through the bolt nut piece (2012) after being in butt joint.

3. The height-adjustable cast-in-situ box girder formwork system as claimed in claim 2, wherein the upper end of the strip-shaped connecting plate (2011) is detachably connected with the outer convex arc plate (202) through the bolt and nut piece (2012).

4. The height-adjustable cast-in-situ box girder formwork system according to claim 1, wherein the box girder bottom formwork (1) comprises a plurality of steel girders (100) which are arranged at intervals along the width direction of the box girder, a plurality of bottom formwork square timber (101) which are orthogonal to the steel girders (100) are arranged on the plurality of steel girders (100) at intervals, and a bottom formwork panel (102) is supported on the plurality of bottom formwork square timber (101); the first edge of the concave circular arc plate (200) is in smooth contact with the upper end surfaces of the bottom die square timber (101), and the bottom die panel (102) is in butt joint with the lower ends of the side die panels (204).

5. The height-adjustable cast-in-situ box girder formwork system as claimed in claim 4, wherein said box girder bottom formwork (1) further comprises a plurality of first uprights (104) supported at the bottom of said steel girder (100).

6. The height-adjustable cast-in-situ box girder formwork system according to claim 1, wherein the box girder wing formwork (3) comprises a wing formwork square timber (300) which is in smooth contact with the first edge of the outer convex arc plate (202), a wing formwork panel (301) is supported on the wing formwork square timber (300), and the wing formwork panel (301) is in butt joint with the upper end of the side formwork panel (204).

7. The height-adjustable cast-in-situ box girder formwork system as claimed in claim 6, wherein said box girder wing formwork (3) further comprises a plurality of second uprights (302) supported at the bottom of said wing formwork square timber (300).

8. The height-adjustable cast-in-situ box girder formwork system as claimed in claim 7, wherein a plurality of the second uprights (302) are sequentially connected by horizontal tie rods (303).

9. The height-adjustable cast-in-situ box girder formwork system as claimed in claim 7, wherein said box girder side formwork (2) further comprises a diagonal rod (205) supported on said height-adjustable connection (201), said diagonal rod (205) being connected to said second upright (302).